Oracle Linux 9.4 Failure for provided credentials:22

UNIX for Advanced & Expert Users
1

Hello
I have installed Oracle Linux 9.4 on a server. Our security team is unable to connect and scan this server with security tools (we have tried with a user I have given root privileges and a root user).

I did not have this problem with operating systems like OL 8.10 and OL 7.9.

What should I check for OL 9.4. When installing it, I did the same operations as I did in OL 8 and 7.9.

The different thing is that it is mandatory to use NetworkManager in OL 9.4 and network operations are done via keyfile instead of ifcfg files.

2

You are aware that, from OL v7, root is a role and not a user. You would need to convert the role to a user in order to login as root. Also, a specific procedure must be followed to give superuser access to an account.

This might be relevant, maybe not, but a new install would be in this 'role' state until manipulated by the sysadmin.

4

Do you get a time-out (no response)? Then check the internal firewall.

sudo firewall-cmd --list-all
7

I didn't know this information, I will look into it. Thanks

8

My firewalld service is off.

I dumped the contents of the sshd.config file from my oracle linux 8.10 server to the one with oracle linux 9 installed and the security team was able to scan.

I think a parameter in the ssh config was preventing this. Now I need to detect it